Three texts you might consider are:
Goodwin and Mercer, Plant Biochemistry, Pergamon Press. The second ed.
is 1983, and I don't know if there is a more recent one.
Dennis and Turpin, Plant Physiology, Biochemistry & Molec. Biol,
Longman Sci and Tech (John Wiley carries it in U.S.). 1990
Lea and Leegood, Plant Biochemistry and Molecular Biology, John Wiley.
1993.
Best of luck.
-David
David Becker phone:909-621-8602
Dept. Biology fax: 909-621-8878
Pomona College e-mail: dbecker at pomona.edu
609 N. College Ave
Claremont, CA 91711-6339
